A gannet is a seabird that fishes by diving from a great height. If a gannet hits the water at 32 m/s (which they do), what height did it dive from? Assume that the gannet was motionless before starting its dive.
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- An archer shoots an arrow horizontally and his friend drops a marble from the same height when the arrow is released. In the absence of air resistance, which of the following happens? Question 17 options: The arrow hits the ground first. The marble hits the ground first. Both hit the ground at the same time. You cannot tell from the information given.A 1000kg helicopter hovers over a forest fire and starts to squirt water downward with a speed of 10m/s at a rate of 40kg/s. What is the initial upward acceleration on the helicopter when it first starts to release the waterA tennis ball with a speed of 27.8 m per s is moving perpendicular to a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 20.016 m per s. If the ball is in contact with the wall for 0.0133 s, what is the average acceleration of the ball while it is in contact with the wall? Take toward the wall to be the positive direction. Answer in units of m per s2.
- A projectile is thrown from the top of a cliff with an initial speed of 25 m/s at an angle of 600 up from the horizontal. If the projectile lands 100 m from the base of the cliff how tall is the cliff?An archer shoots an arrow horizontally and his friend drops a marble from the same height when the arrow is released. In the absence of air resistance, which of the following happens? The arrow hits the ground first. The marble hits the ground first. O Both hit the ground at the same time. You cannot tell from the information given.A person throws a ball with speed 102 m/s at a 45° angle. How many seconds faster would the ball arrive if the person threw the ball at the same speed and the same distance but made the trip in two identical bumps. Assume that there is no loss of speed at the bounce. Hint: Use R = v2/g * sin(2θ) and t=2*vy(sinθ)/g.
- Suppose a car manufacturer tested its cars for front-end collisions by hauling them up on a crane and dropping them from a certain height. What height corresponds to a collision at 55 km/hkm/h ? Express your answer to two significant figures and include the appropriate units. What height corresponds to a collision at 110 km/hkm/h ? Express your answer to two significant figures and include the appropriate units.How long does it take to hit the ground?A stone is thrown upward from a cliff at an angle of 35 degrees above the horizontal with a speed of 47 m/s. The stone hits the ground 5.0 s later. a) What is the x component of the stones initial velocity? v47.0m/s 35 O51.0m/s 041.0 m/s 38.5 m/s O270 m/s
- If the ball is initially thrown with a speed of V0=17.5 m/s, what is the x-component of the initial velocity?A bridge that was 11.2 m long has been washed out by the rain several days ago. How fast must a car be going to successfully jump the stream? Although the road is level on both sides of the bridge, the road on the far side is 2.1 m lower than the road on this side.An Olympic diver is on a diving platform 4.5 m above the water. To start her dive, she runs off of the platform with a speed of 1.3 m/s in the horizontal direction. Determine the diver's speed just before she enters the water. 4.7 m/s 9.5 m/s 6.4 m/s 0 m/s